how do I configure my TS873A nas to my router, modum to my computer

[TribalHound]

You should be able to plug a network cable into the NAS and the other end into your Router (or a switch connected to the router).
You probably want to go into your router and assign the NAS a fixed IP address on your local network once it's turned on.

From your computer, install the latest version of QFinderPro https://www.qnap.com/en-uk/utilities/essentials
Once that's done, you should be able to connect to it.

Follow any (or all) of the guides below and get the most out of your system

QNAP NAS Setup Guide 2021/2022 #1 - Build, RAID, Volumes, Sharing, Mapping Drives & Users - https://youtu.be/_kCS6e1ZoiQ

QNAP NAS Setup Guide 2021/2022 #2 - Snapshots, NAS to NAS CLOUD USB SaaS Backups & Sync - https://youtu.be/Y34jrKeQ1Uw

QNAP NAS Setup Guide 2021/2022 #3 - Photography, Indexing, Sharing, Cataloging & Moving from Google - https://youtu.be/BpHn0ZLzAgE

QNAP NAS Setup Guide 2022 #4 - Music Audio, Indexing, Sharing and Streaming over DLNA - https://youtu.be/L1os27GWKZ0

QNAP NAS Setup Guide 2022 #5 - Video Station, Streaming to Fire TV, Streaming over DLNA/uPnP - https://youtu.be/N_HE78fN1n4

QNAP NAS Setup Guide 2022 #6 - Setting Up Plex Media Server Right First Time! - https://youtu.be/XITv6EkSJg8

Hope this all helps.